Cable eijob



June 3., 1924. 1,496,142

o. A. WIRKKALA CABLE KNOB Filed Aug. l0 1922,

BY @Jaca/hf;

ATTORNEY.

vPatented J une 3, 1924.

UNITED STATES OSCAR A. WIRKKALA, OF KENT, WASHINGTON.

CABLE KNOB.

Application filed August 10, 1922. Serial No. 581,037.

To all whom t 'may concern:

Be it known that I, OSCAR A. VIRKKALA, a citizen of the United States, and a resident of Kent, in the county of King and State of lVashington, have invented new and useful Cable Knobs, of which the followino` is a specification.

ily invention relates to improvements in knobs for strain cables of hardened steel wires, and one of the objects of my improvements is to provide a knob suitable for securely fastening on a cable end without the usual filling of soft metal, and another object of my improvements is to adapt said knob for fastening on the end of the cable in a manner which will not allow the cable to loosen within the knob and move forward through the same when not under strain.

Hitherto, for this purpose, large knobs have been used having a conical interior opening' therethrough. Into the smaller end of this opening the cable end is passed and then unstranded. Molten Babbitt metal is then poured lin to fill the interior of the knob. In order to have a secure fastening with this method the knob must be long enough to provide a. considerable surface of contact between'the cable wires and the 3G soft filling metal.

I am using knobbed cable ends in especially-designed loggingrigging devices wherein. for greater convenience, the knobs had better be small and light, though they 35 must be firmly fixed to the cable.

To provide suitably knobbed cables for my purpose I have invented the process of fixing a knob and a cable end therein. Said knob is illustrated in the accompanying sheet of drawings, forming a part of this specification, in which Figure l is a plan View of my cable knob, Fig. 2 is a side elevation of Fig. l, Fig. 3 is a plan'view of the knob with an unstranded cable end therein, Fig. t is a side elevation of Fig. 3 with said knob shown in vertical cross section, Fig. 5 is a plan view of the knob with the unstrandedy end of a cable therein, the strands of which have been folded over7 Fig. 6 is a side elevation of Fig. showing the knob in vertical cross section, and

Fig. 7 is a side elevation of a completely knobbed cable end in section on a medial vertical plane.

Similar characters refer to similar parts throughout. Certain parts are broken away to show other parts hidden thereby.

yMore particularly: The knob is shown at 8 and consists of a thimble having a cylindro-conical, shouldered opening therethrough of which the conical part 9 at its smaller end passes into the cylindrical part il at shoulder l0. Two diametrical lugs l2, l2 project from the thinner end walls of the knob. Into knob 8 through hole ll 65 is inserted one end of wire cable 13, and the ends of the cable are unstranded at ll. Then rope core 15 is cut oft' at the point of unstranding. Unstranded ends l-l are then raised to a red heat and folded over, preferably toward the center of the cable, as at am. Cable 13 is then forcibly drawn back into knob 8 while ends a14 are beaten with hammer blows. After being thus forced as far as possible within the knob cavity wedge 16 is driven longitudinally into the center of the cable ends as far as possible when its protruding end is cut 0H flush with said cable end. Then lugs l2 are bent over towardl the center of the knob and beaten down with hammer blows till they appear as shown at a, o, in Fig. 7, and the process of Iirmly fixing the cable end in the knob is completed.

I claim:

1. A cable knob consisting of a thimble having lugs protruding longitudinally lfrom its front end adapted for bending centrally, whereby a cable end in said knob is restrained from moving further therethrough by said bent-over lugs.

2. A cable knob having a cylindroconicalv hole therethrough longitudinally` a cable end introduced into said knob through the smaller end of said hole having its individual wire ends bent over and forced back into said knob hole, and a wedge forced centrally and longitudinally between said wire ends whereby said wire ends and said wedge fill said hole.

3. A cable knob having a cylindroconical longitudinal hole therethrough and longi- 'Q21 l Y 1,496,142

tudinal lugs on its outer end adapted for Wire ends into said knob hole whereby Said bending over eenterward, a cable end introwire ends and said Wedge fill said hole and duced into the smaller end of said hole said lugs prevent further movement of said 10 having,` its individual Wire ends bent over cable through said knob While the increased 5 and forced back into said hole with said diameter of said cable end prevents its lugs bent thereover, and e Wedge forced movement backward out of said hole. centrally and longitudinally between said OSCAR A. VIRKKALA. 

